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How can I add a bibliography to a letter? I have tried both scrlttr2 and letter document classes. I used this example and got this error from the scrlttr2 version and similar from the letter version:
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<div>%!TEX TS-program = pdflatexmk</div>
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<div>\documentclass[fontsize=12pt, paper=letter]{scrlttr2}</div>
<div>\usepackage[longnamesfirst]{natbib} </div>
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<div>% Dont forget to read the KOMA-Script documentation, scrguien.pdf</div>
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<div>\setkomavar{fromname}{} % your name</div>
<div>\setkomavar{fromaddress}{Address \\ of \\ Sender}</div>
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<div>\setkomavar{signature}{} % printed after the \closing</div>
<div>\renewcommand{\raggedsignature}{\raggedright} % make the signature ragged right</div>
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<div>\setkomavar{subject}{} % subject of the letter</div>
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<div>\begin{document}</div>
<div>\bibliographystyle{apalike}</div>
<div>\begin{letter}{Name and \\ Address \\ of \\ Recipient}</div>
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<div>\opening{} % eg. Hello</div>
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<div>some stuff</div>
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<div>\closing{} %eg. Regards</div>
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<div>\bibliography{unified}</div>
<div>\end{letter}</div>
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<div>\end{document}</div>
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<div>....</div>
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<div style="margin: 0px; font-size: 12px; font-family: Menlo;">)) (/usr/local/texlive/2014/texmf-dist/tex/latex/koma-script/DIN.lco)</div>
<div style="margin: 0px; font-size: 12px; font-family: Menlo;">(/usr/local/texlive/2014/texmf-dist/tex/latex/natbib/natbib.sty</div>
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<div style="margin: 0px; font-size: 12px; font-family: Menlo;">/usr/local/texlive/2014/texmf-dist/tex/latex/natbib/natbib.sty:1063: LaTeX Erro</div>
<div style="margin: 0px; font-size: 12px; font-family: Menlo;">r: Environment thebibliography undefined.</div>
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<div style="margin: 0px; font-size: 12px; font-family: Menlo;">See the LaTeX manual or LaTeX Companion for explanation.</div>
<div style="margin: 0px; font-size: 12px; font-family: Menlo;">Type H <return> for immediate help.</div>
<div style="margin: 0px; font-size: 12px; font-family: Menlo;"> ... </div>
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<div style="margin: 0px; font-size: 12px; font-family: Menlo;">l.1063 \renewenvironment{thebibliography}</div>
<div style="margin: 0px; font-size: 12px; font-family: Menlo;"> [1]{%</div>
<div style="margin: 0px; font-size: 12px; font-family: Menlo;">? </div>
<div style="margin: 0px; font-size: 12px; font-family: Menlo;">Process aborted</div>
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<div>Sam</div>
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